RT Journal Article
SR Electronic
T1 On the glacial-interglacial variability of the Asian monsoon in speleothem δ<sup>18</sup>O records
JF Science Advances
JO Sci Adv
FD American Association for the Advancement of Science
SP eaay8189
DO 10.1126/sciadv.aay8189
VO 6
IS 7
A1 Liu, G.
A1 Li, X.
A1 Chiang, H.-W.
A1 Cheng, H.
A1 Yuan, S.
A1 Chawchai, S.
A1 He, S.
A1 Lu, Y.
A1 Aung, L. T.
A1 Maung, P. M.
A1 Tun, W. N.
A1 Oo, K. M.
A1 Wang, X.
YR 2020
UL http://advances.sciencemag.org/content/6/7/eaay8189.abstract
AB While Asian monsoon (AM) changes have been clearly captured in Chinese speleothem oxygen isotope (δ18O) records, the lack of glacial-interglacial variability in the records remains puzzling. Here, we report speleothem δ18O records from three locations along the trajectory of the Indian summer monsoon (ISM), a major branch of the AM, and characterize AM rainfall over the past 180,000 years. We have found that the records close to the monsoon moisture source show large glacial-interglacial variability, which then decreases landward. These changes likely reflect a stronger oxygen isotope fractionation associated with progressive rainout of AM moisture during glacial periods, possibly due to a larger temperature gradient and suppressed plant transpiration. We term this effect, which counteracts the forcing of glacial boundary conditions, the moisture transport pathway effect.